/*-
 * Copyright (c) 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <ANY.h>
#include <asn_internal.h>
#include <errno.h>

static asn_OCTET_STRING_specifics_t asn_DEF_ANY_specs = {
    sizeof(ANY_t), offsetof(ANY_t, _asn_ctx), ASN_OSUBV_ANY};
asn_TYPE_descriptor_t asn_DEF_ANY = {
    "ANY",
    "ANY",
    OCTET_STRING_free,
    OCTET_STRING_print,
    asn_generic_no_constraint,
    OCTET_STRING_decode_ber,
    OCTET_STRING_encode_der,
    OCTET_STRING_decode_xer_hex,
    ANY_encode_xer,
    OCTET_STRING_decode_uper,
    OCTET_STRING_encode_uper,
    OCTET_STRING_decode_aper,
    OCTET_STRING_encode_aper,
    OCTET_STRING_compare,
    0, /* Use generic outmost tag fetcher */
    0,
    0,
    0,
    0,
    0, /* No PER visible constraints */
    0,
    0, /* No members */
    &asn_DEF_ANY_specs,
};

asn_enc_rval_t ANY_encode_xer(asn_TYPE_descriptor_t *td, void *sptr, int ilevel,
                              enum xer_encoder_flags_e flags,
                              asn_app_consume_bytes_f *cb, void *app_key) {
  if (flags & XER_F_CANONICAL) {
    /*
     * Canonical XER-encoding of ANY type is not supported.
     */
    _ASN_ENCODE_FAILED;
  }

  /* Dump as binary */
  return OCTET_STRING_encode_xer(td, sptr, ilevel, flags, cb, app_key);
}

struct _callback_arg {
  uint8_t *buffer;
  size_t offset;
  size_t size;
};

static int ANY__consume_bytes(const void *buffer, size_t size, void *key);

int ANY_fromType(ANY_t *st, asn_TYPE_descriptor_t *td, void *sptr) {
  struct _callback_arg arg;
  asn_enc_rval_t erval;

  if (!st || !td) {
    errno = EINVAL;
    return -1;
  }

  if (!sptr) {
    if (st->buf) FREEMEM(st->buf);
    st->size = 0;
    return 0;
  }

  arg.offset = arg.size = 0;
  arg.buffer = 0;

  erval = der_encode(td, sptr, ANY__consume_bytes, &arg);
  if (erval.encoded == -1) {
    if (arg.buffer) FREEMEM(arg.buffer);
    return -1;
  }
  assert((size_t)erval.encoded == arg.offset);

  if (st->buf) FREEMEM(st->buf);
  st->buf = arg.buffer;
  st->size = arg.offset;

  return 0;
}

int ANY_fromType_aper(ANY_t *st, asn_TYPE_descriptor_t *td, void *sptr) {
  uint8_t *buffer = NULL;
  ssize_t erval;

  if (!st || !td) {
    errno = EINVAL;
    return -1;
  }

  if (!sptr) {
    if (st->buf) FREEMEM(st->buf);
    st->size = 0;
    return 0;
  }

  erval = aper_encode_to_new_buffer(td, td->per_constraints, sptr,
                                    (void **)&buffer);

  if (erval == -1) {
    if (buffer) FREEMEM(buffer);
    return -1;
  }
  assert((size_t)erval > 0);

  if (st->buf) FREEMEM(st->buf);
  st->buf = buffer;
  st->size = erval;

  return 0;
}

ANY_t *ANY_new_fromType(asn_TYPE_descriptor_t *td, void *sptr) {
  ANY_t tmp;
  ANY_t *st;

  if (!td || !sptr) {
    errno = EINVAL;
    return 0;
  }

  memset(&tmp, 0, sizeof(tmp));

  if (ANY_fromType(&tmp, td, sptr)) return 0;

  st = (ANY_t *)CALLOC(1, sizeof(ANY_t));
  if (st) {
    *st = tmp;
    return st;
  } else {
    FREEMEM(tmp.buf);
    return 0;
  }
}

ANY_t *ANY_new_fromType_aper(asn_TYPE_descriptor_t *td, void *sptr) {
  ANY_t tmp;
  ANY_t *st;

  if (!td || !sptr) {
    errno = EINVAL;
    return 0;
  }

  memset(&tmp, 0, sizeof(tmp));

  if (ANY_fromType_aper(&tmp, td, sptr)) return 0;

  st = (ANY_t *)CALLOC(1, sizeof(ANY_t));
  if (st) {
    *st = tmp;
    return st;
  } else {
    FREEMEM(tmp.buf);
    return 0;
  }
}

int ANY_to_type(ANY_t *st, asn_TYPE_descriptor_t *td, void **struct_ptr) {
  asn_dec_rval_t rval;
  void *newst = 0;

  if (!st || !td || !struct_ptr) {
    errno = EINVAL;
    return -1;
  }

  if (st->buf == 0) {
    /* Nothing to convert, make it empty. */
    *struct_ptr = (void *)0;
    return 0;
  }

  rval = ber_decode(0, td, (void **)&newst, st->buf, st->size);
  if (rval.code == RC_OK) {
    *struct_ptr = newst;
    return 0;
  } else {
    /* Remove possibly partially decoded data. */
    ASN_STRUCT_FREE(*td, newst);
    return -1;
  }
}

int ANY_to_type_aper(ANY_t *st, asn_TYPE_descriptor_t *td, void **struct_ptr) {
  asn_dec_rval_t rval;
  void *newst = 0;

  if (!st || !td || !struct_ptr) {
    errno = EINVAL;
    return -1;
  }

  if (st->buf == 0) {
    /* Nothing to convert, make it empty. */
    *struct_ptr = (void *)0;
    return 0;
  }

  rval = aper_decode(0, td, (void **)&newst, st->buf, st->size, 0, 0);
  if (rval.code == RC_OK) {
    *struct_ptr = newst;
    return 0;
  } else {
    /* Remove possibly partially decoded data. */
    ASN_STRUCT_FREE(*td, newst);
    return -1;
  }
}

static int ANY__consume_bytes(const void *buffer, size_t size, void *key) {
  struct _callback_arg *arg = (struct _callback_arg *)key;

  if ((arg->offset + size) >= arg->size) {
    size_t nsize = (arg->size ? arg->size << 2 : 16) + size;
    void *p = REALLOC(arg->buffer, nsize);
    if (!p) return -1;
    arg->buffer = (uint8_t *)p;
    arg->size = nsize;
  }

  memcpy(arg->buffer + arg->offset, buffer, size);
  arg->offset += size;
  assert(arg->offset < arg->size);

  return 0;
}
